Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Pelton"”.
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Numerical and experimental investigation of flow in horizontal axis Pelton turbines
The Pelton turbine is widely considered a mature technology, existing for more than a century. However, manufacturers concerns over operating efficiency are a key driver in the continued design development. In recent decades, the use of Computational Fluid Dynamics (CFD) has become well established …
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Optimisation and efficiency improvement of pelton hydro turbine using computational fluid dynamics and experimental testing
… was to develop a generic optimisation method for Pelton turbine runners and assess the key design parameters using Computational Fluid Dynamics (CFD). This optimisation was applied on a modern commercial Pelton turbine runner taken as a base design. The design together with the field knowledge and …
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The design of a controllable energy recovery device for solar powered reverse osmosis desalination with experimental validation
… presented here uses a variable nozzle and a Pelton wheel to recover energy from the high pressure concentrated brine exiting the reverse osmosis membrane. The components are designed, analytically modeled using fundamental engineering principles, and experimentally tested. The experimental …
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A Virtual ethnography of the Black Flag Cafe: a forum for people who travel to dangerous places.
… community created by the writer Robert Young Pelton, author of the books Come Back Alive and The World’s Most Dangerous Places. This is a case study that has made use of virtual ethnography and descriptive content analysis to explore the forum and its members. The research has identified four …
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The Turgo impulse turbine : a CFD based approach to the design improvement with experimental validation
… This work has however focussed mainly on Pelton turbines and the use of CFD in the analysis and optimisation of Turgo turbines is still in its infancy, with no studies showing a complete simulation of a Turgo runner capturing the torque on the inside and outside blade surfaces and …
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Hydroelectric power station : Nigerleq
… of 3MW spread between two horizontal twin-jet Pelton turbines to allow for optimal generation strategy, providing approximately 19.8 GWh annually. The Nigerleq Low reservoir is connected to the powerhouse via a 1100m long transport tunnel and a 1130m long DN900 steel penstock leading the flow …
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Teachers’ Perceptions of the Impact of Social and Emotional Support Services on Academic Performance
Background: In 1966, a report was commissioned to determine the academic status of students across the United States (Dickenson, Winter 2016). The Coleman report determined that students of various ethnic and socio-economic groups had varied levels of academic proficiencies (Coleman, 1966). …
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Calmness as a Quality of Teacher Presence and the Impact on Learning
<p>This study seeks to identify the conditions for calmness within an educator's life and its impact on educators and students. Research shows that mindfulness practices can be implemented in the classroom and help students focus (Riner & Tanase, 2014). According to Kane (2018), implementing …
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The Japanese-American dilemma: A comparison of their relationship within George Modelski's theoretical framework of long cycles
The objective of this thesis is to address the nature of Japanese-American bilateral relations in the twentieth century. An adaptation of George Modelski's theory of global long cycles is the tool used to analyze the relationship. This adaptation gives a broader evaluation of the relationship and …
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One-Dimensional Radial Flow Turbomachinery Performance Modeling
The Two-Element In Series (TEIS) and Two-Zone models have been used successfully for over twenty years to model test data for radial flow compressors and pumps. The models can also be used to predict the performance of new machines provided that the model inputs can be accurately specified. …
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Evidence-Based Plan for Promoting Physical Activity Among Deaf Adults in Primary Care
Objectives. The purpose of this practice inquiry (PI) was to develop an evidence based plan for promoting physical activity among Deaf adults in a primary care setting. The aims of this PI were to 1) review research about the relationship between physical activity and health 2) review research …
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Law, Autonomy, and Local Government: A Legal History of Municipal Corporations in Canada West/Ontario, 1850-1880
The historiography of local government in mid-nineteenth century Canada West/Ontario is divided on the question of municipal autonomy. The more dominant thesis asserts that the Municipal Corporations (Baldwin) Act of 1849 ushered in a period of freedom for municipalities. The second depicts the Act …
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The financing of public junior colleges in Texas
The purpose of this study is to solve the following problems: 1. What were the sources of financial support in the public junior colleges included in this study? 2. What were the current educational expenditures for the different phases of the school program? 3. What was the cost per student …
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The influence of horizontal resolution and boundary forcing in simulating hurricanes over the South Atlantic Ocean using WRF
A hurricane is a threat to socio-economic activities in coastal communities bordering the South Atlantic Ocean (SAO). Hurricanes rarely form over this region and as such these communities are not prepared for them. Previous studies have suggested that anthropogenic warming may lead to more frequent …
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The terminal pleistocene of Klipfonteinrand rock shelter in the Cederberg
This thesis focuses on Klipfonteinrand Rock Shelter in the eastern Cederberg, during the Late Pleistocene period (22.3 - 13.4 cal kyr BP), and specifically the materials analysed after the completion of excavations at the site. The study aims, firstly, to unpack changes in the composition of the …
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Řídicí systémy Kaplanovy turbíny
V této bakalářské práci je uvedeno stručné rozdělení nejužívanějších druhů vodních turbín, následně je obsažen důkladný rozbor konstrukce a především regulace Kaplanovy turbíny. Dále jsou v ní popsány jednotlivé mechanismy a pochody ve stroji při regulaci rozvaděčem a lopatami oběžného kola. Je zde …
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Ground stone lithic technology of the Indian Peaks, Colorado, USA
Ground stone tools are a long-noted aspect of pre-contact archaeological assemblages from the high elevations (2975-3666 meters asl) of the Colorado Front Range (CFR). The tools are present in small frequencies at around 40% of the sites thus far recorded, and are typically present as heavily …